1) Update __version__
in slackviewer/__init__.py
to the new version
2) Commit this change as "Release 0.9.0" to master, as an example
3) Create a release on GitHub with the new version (e.g., 0.9.0) targeting master
4) git pull
locally
5) git clean -fdx dist
to clean anything already in the dist/ directory
6) Run python setup.py sdist
(in the correct environment) to create the package to upload
7) Run twine upload dist/*
to push to PyPI